Nothing is more frustrating than liners that don't fit your litter box. This guide will help you find the perfect size the first time.
Standard Litter Box Sizes
Small: ~14"×10" (kittens/apartments). Standard: ~18"×14" (most adult cats). Large: ~22"×17" (big cats, covered boxes). Extra-large: 24"+ (large breeds like Maine Coon). Measure your box's inner dimensions — the liner needs to cover the interior and fold over the edges.
How to Measure Your Box
Measure length, width, and depth. Add the depth twice to the length and width (the liner must cover the sides). Example: 20"×16" box with 6" depth needs a liner that's at least 32"×28" to provide adequate coverage and overhang.
Covered vs. Open Litter Boxes
Covered boxes often need larger liners since the lid adds dimension. Some liners are specifically designed for covered boxes with pre-formed shapes. For hooded boxes, measure with the hood removed and add 4-6" for the overhang catch.
Overhang: Why It Matters
Adequate overhang (3-4") keeps the liner secured over the box rim. Too little overhang and the liner slides down; too much and it bunches uncomfortably. Most quality liners include drawstring pulls to cinch and secure the liner in place.
Pawsitive Earth Compostable Litter Liners (100-pack)
Pawsitive Earth liners come in generous sizing that fits standard through large litter boxes, with drawstrings for secure placement.
Check Price on Amazon →Frequently Asked Questions
Slightly oversized liners work fine — excess material folds down the outside of the box. The liner will still function properly.
It's not recommended. Cutting liners weakens the material and may cause tearing during use. Better to find the right size from the start.
Self-cleaning/automatic boxes typically don't accommodate standard liners due to their mechanisms. Check your specific model before purchasing.
Last updated: 2026-03-26. We test and research products independently. As an Amazon Associate we earn from qualifying purchases.